I've just been Skyped out of the blue by a second cousin that I didn't know I had, one Dovid Pink. His mother is Chana, her father was Yehuda Berlinger, and his father was my great-grandfather, Naphtali Berlinger. I was named after Dovid's grandfather.
He has his own blog: http://familypink.blogspot.com/. It contains only pictures of their family, so is not of general interest.
But, hey, cool. We talked on Skype, messaged URLs and email addresses, exchanged blog info, and I wondered how my great-grandfather would have felt about this incredible power for exchanging information that we each held at our fingertips. Families wandered around for years or decades trying to find each other only half a century ago.